Safety-lock.



J. HERR. SAFETY 1.00K. ArPLIoATIOxrIALnD n nu: e, `1 9oe.

` 907,234. Patented Dec. 22, 1908.

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`have invented .new and useful' Improvements 1n ASafetyLocks,

. of which aie followings- 'a speciiication. f

secured to the` inner side of .a 'dooryan'd adapted to beloperated by akeytwhichv` is ,introducedsinto the usual keyhole of thel main lock ofsuch door. i

:In .the accompanying drawings: Figure' 1 is alplan, vpart y insection,^of `afjgdoor pro-` vided with myimproved safety lock; Fig. 2 afront lelevation, partly broken, away, of F1g. l; Fig. 3a. front view,partly insection, of the safety lock, with the cover rembved; Fiv. 4 asimilar View showingthe parts in a diierent position; Fig. 5 a plan viewof Fig.

y3, showing the cover in section; F 6 an enlarged cross section on line66, i

g- 4;V Fig. 7 a similar section, showing the parts in a differentposition; and Fig. 8 a perspective View of the key. I

` The door 10 is provided with the usual lock 11 the bolt 12 of which isadapted to be projected into a corresponding recess 13 of door frame 14.'Hit-he inner side of door 10 is *securedby screws 15 the base plate 16of my improved safety lock. Base plate 16 is prov1 ed with a number ofperforated posts 17, 1

18 and' 19 for the support of an axially movable locking bolt 20. Thelatter is normally pressed outwards by a coiled spring 21, in? terposedbetween Ipost 18 and arcollar 22 of bolt 20. The rear or inner sectionof the bolt is toothed as at 23 for the engagement ywith a toothed wheelor pinion 24, having a mutilated section 25, and keyed to a spindle 26.The latter passes through corresponding perforations of plate 16 andof aframe 27, which may be made integral with post 19. Near its one end,spindle 26 is provided with a collar 28, grooved as at 29, the spindleprojecting slightly beyond such collar. At its other end, spindle 26 isthreaded as at 30 for the engagement-with a knob or handle 31.

In order to retain bolt 20 in its retracted position, if so desired,bolt 20 is provided `with a'pin or stud 32 having a beveled top (Fig.5), and adapted to be engaged by a resilient arm 33 secured to a post 34of base plate 16.` A The co-relation of the Yarts is such that, whenspindle'26 is rotate 'in the .the

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direetionfof ai@ maw; (rig. a); either by knob 31 or-by asuitabl'e'key,l hereafter more fully described, pinion will engage 'rackQ3,to retiractholt 2O,A until stud 32 has passed underneath arm 33,whereupon the mutilated.,

section'of pinion 24 arrives'opposite rack,.23l

(Fig). :During the retraction *of bolt '20, 'withthe free end of arm 33,so that the-lat 'ter will be gradually raised, while stud32f eveled stud32'comes into engagement passes with itsy inclinedrto'p underneathfthe',

the lteeth fof pinion 24 have cleared rc'k 23.

arm. After the stud has cleared the Vvarm,A thelatter will, owingtoit'sK resiliency, dre-"I 'scend infront ofstud 32, to'prevent spring'21 `from projecting bolt' 2O outwards, after For'releasing bolt20pifnion -24 is' provided ,i

at its mutilated u .35, adaptedv .to 4engage the free 'end of arm 33. Itwill be readily understood that, when pinion 24 is turned in thedirection of the arro'w, (Fig. 4,) shoulder 35 will lift arm 33, untilit clears stud 32, (Fig. 7,) so that spring 2l is free to project bolt2O outwards (Figs. 3 and 5).

The operating parts of the safety lock are inclosed 'within a. suitablecasing 36, riveted to plate 16, for which purpose casing 36 is providedwith a'number of prongs 37, erligaging corresponding openings 38 of pate 1 y 4 j y In applying the safety lock described to door 10, baseplatel16 is so secured to the inner side thereof, that the `free end ofspindle 26, as well as collar 28 are received within the key hole 39 oflock 11 `(Figs. 1 and 2). For operating the safety lock from theoutside, a key 40 is used, which terminatesin a sharpened fork 41,adapted to enter grooves 29 of collar 28, while' the recess 42 of thekey accommodates the protruding end of. spindle 26.

If the occupant of an apartment, proafter the key has grasped groovedcollar 28, it is turned to the left, untilV shoulder 35` raises arm 33to liberate stud 3 2, whereupon spring 21 will project bolt 20- intolengagement with a keeper 43 of door frame 14.

Saat-)e125 with' ashbuiaer The door is then locked by means of lock` 11in the usual manner. u If, a burglar should attempt to entertheapartment through door, 11, and,l 1f he should succeed in opening lock11, he will' iind the door still locked. He will thus assume that thesame must be bolted from the inside by the person or persons occupyingthe apartment, and will abstain from torcibly opening the door. Thereason for setting' collar 28 back from the end of spindle 26 is toprevent the opening of the. safety lock by means of a screw driver or asimilar tool. Itsisobvious that the head of spindle 26, which enters keyhole 39, inay be shaped diiierently for the use o keys, others than thatshown in Fig. 8, Without departing from the spirit of niy invention.

lhen the occupant returns to his apartment, he will readily gain accessthereto by successively opening the regular lock. and the safety lock,

VI claim:

l. A device of the character described, comprising a door, a locksecured thereto and having a key hole, a safety-lock, a bolt. slidabletherein, and a spindle rotatably mounted in the safety lock andoperatively connected to the bolt, said spindle projecting partly intothe key hole ot' the first named lock, substantially as specified.

2. A device of the character described,

comprising' a door, a loclr secnredjthereto and having a key hole, asafety-lock, a bolt slidable therein, a spindle rotatably mounted in thesafety lock and operatively connected the bolt, and a collar on thespindlevt-hat is received Within the key hole ofthe/'first named lock,substantially as specified.

3. A safety lock comprising a springinfluenced bolt having a toothedsection, a.

stud on the bolt, a mutilated pinion adapted to engage the toothed boltsection, a resilient arm adapted to engage the stud, and a shoulder onthe pinion adapted to engage theV arm, substantially as specified.

Signed by nie, at New York city, (Manhattan,) ll, Y., this fourth day ofJ une,

JOSEF HERR. VVitnesse-s ARTHUR E. ZUMPE, lV. R. SCHULZ.

